It's difficult for browser makers to differentiate themselves due to web standards. Thus it becomes a money-takes-all game where the diminishing returns on performance investment can be afforded only by the richest (Chrome). Maybe Mozilla should differentiate itself in another way - politically? It already fired Eich on progressive grounds. Why not go all in and become the explicitly-progressive browser? See women's march/trump protests for market share potential. Nurture add-ins that do stuff that stock-price obsessed corporations are too scared to do. Skate to where the puck is going....the anti-capitalist browser.... supporting things that corpos can't.

As an aside, as a Linux-all-day dev I use Firefox almost exclusively. I can do Chrome, but something stops me. One of those things is the idea that we need browser diversity. Also chrome just isn't "better enough" than Firefox for me - in fact I find the difference very marginal now.